239 lines
7.0 KiB
Go
239 lines
7.0 KiB
Go
package cart
|
|
|
|
import (
|
|
"encoding/json"
|
|
"testing"
|
|
)
|
|
|
|
func TestPriceMarshalJSON(t *testing.T) {
|
|
p := Price{IncVat: 13700, VatRates: map[float32]int64{25: 2500, 12: 1200}}
|
|
// ExVat = 13700 - (2500+1200) = 10000
|
|
data, err := json.Marshal(p)
|
|
if err != nil {
|
|
t.Fatalf("marshal error: %v", err)
|
|
}
|
|
// Unmarshal into a generic struct to validate fields
|
|
var out struct {
|
|
ExVat int64 `json:"exVat"`
|
|
IncVat int64 `json:"incVat"`
|
|
Vat map[string]int64 `json:"vat"`
|
|
}
|
|
if err := json.Unmarshal(data, &out); err != nil {
|
|
t.Fatalf("unmarshal error: %v", err)
|
|
}
|
|
if out.ExVat != 10000 {
|
|
t.Fatalf("expected exVat 10000 got %d", out.ExVat)
|
|
}
|
|
if out.IncVat != 13700 {
|
|
t.Fatalf("expected incVat 13700 got %d", out.IncVat)
|
|
}
|
|
if out.Vat["25"] != 2500 || out.Vat["12"] != 1200 {
|
|
t.Fatalf("unexpected vat map: %#v", out.Vat)
|
|
}
|
|
}
|
|
|
|
func TestNewPriceFromIncVat(t *testing.T) {
|
|
p := NewPriceFromIncVat(1250, 25)
|
|
if p.IncVat != 1250 {
|
|
t.Fatalf("expected IncVat %d got %d", 1250, p.IncVat)
|
|
}
|
|
if p.VatRates[25] != 250 {
|
|
t.Fatalf("expected VAT 25 rate %d got %d", 250, p.VatRates[25])
|
|
}
|
|
if p.ValueExVat() != 1000 {
|
|
t.Fatalf("expected exVat %d got %d", 750, p.ValueExVat())
|
|
}
|
|
}
|
|
|
|
func TestSumPrices(t *testing.T) {
|
|
// We'll construct prices via raw struct since constructor expects tax math.
|
|
// IncVat already includes vat portions.
|
|
a := Price{IncVat: 1250, VatRates: map[float32]int64{25: 250}} // ex=1000
|
|
b := Price{IncVat: 2740, VatRates: map[float32]int64{25: 500, 12: 240}} // ex=2000
|
|
c := Price{IncVat: 0, VatRates: nil}
|
|
|
|
sum := SumPrices(a, b, c)
|
|
|
|
if sum.IncVat != 3990 { // 1250+2740
|
|
t.Fatalf("expected incVat 3990 got %d", sum.IncVat)
|
|
}
|
|
if len(sum.VatRates) != 2 {
|
|
t.Fatalf("expected 2 vat rates got %d", len(sum.VatRates))
|
|
}
|
|
if sum.VatRates[25] != 750 {
|
|
t.Fatalf("expected 25%% vat 750 got %d", sum.VatRates[25])
|
|
}
|
|
if sum.VatRates[12] != 240 {
|
|
t.Fatalf("expected 12%% vat 240 got %d", sum.VatRates[12])
|
|
}
|
|
if sum.ValueExVat() != 3000 { // 3990 - (750+240)
|
|
t.Fatalf("expected exVat 3000 got %d", sum.ValueExVat())
|
|
}
|
|
}
|
|
|
|
func TestSumPricesEmpty(t *testing.T) {
|
|
sum := SumPrices()
|
|
if sum.IncVat != 0 || sum.VatRates == nil { // constructor sets empty map
|
|
t.Fatalf("expected zero price got %#v", sum)
|
|
}
|
|
}
|
|
|
|
func TestMultiplyPriceFunction(t *testing.T) {
|
|
base := Price{IncVat: 1250, VatRates: map[float32]int64{25: 250}}
|
|
multiplied := MultiplyPrice(base, 3)
|
|
if multiplied.IncVat != 1250*3 {
|
|
t.Fatalf("expected IncVat %d got %d", 1250*3, multiplied.IncVat)
|
|
}
|
|
if multiplied.VatRates[25] != 250*3 {
|
|
t.Fatalf("expected VAT 25 rate %d got %d", 250*3, multiplied.VatRates[25])
|
|
}
|
|
if multiplied.ValueExVat() != (1250-250)*3 {
|
|
t.Fatalf("expected exVat %d got %d", (1250-250)*3, multiplied.ValueExVat())
|
|
}
|
|
}
|
|
|
|
func TestPriceAddSubtract(t *testing.T) {
|
|
a := Price{IncVat: 1000, VatRates: map[float32]int64{25: 200}}
|
|
b := Price{IncVat: 500, VatRates: map[float32]int64{25: 100, 12: 54}}
|
|
|
|
acc := NewPrice()
|
|
acc.Add(a)
|
|
acc.Add(b)
|
|
|
|
if acc.IncVat != 1500 {
|
|
t.Fatalf("expected IncVat 1500 got %d", acc.IncVat)
|
|
}
|
|
if acc.VatRates[25] != 300 || acc.VatRates[12] != 54 {
|
|
t.Fatalf("unexpected VAT map: %#v", acc.VatRates)
|
|
}
|
|
|
|
// Subtract b then a returns to zero
|
|
acc.Subtract(b)
|
|
acc.Subtract(a)
|
|
if acc.IncVat != 0 {
|
|
t.Fatalf("expected IncVat 0 got %d", acc.IncVat)
|
|
}
|
|
if len(acc.VatRates) != 2 || acc.VatRates[25] != 0 || acc.VatRates[12] != 0 {
|
|
t.Fatalf("expected zeroed vat rates got %#v", acc.VatRates)
|
|
}
|
|
}
|
|
|
|
func TestPriceMultiplyMethod(t *testing.T) {
|
|
p := Price{IncVat: 2000, VatRates: map[float32]int64{25: 400}}
|
|
// Value before multiply
|
|
exBefore := p.ValueExVat()
|
|
p.Multiply(2)
|
|
if p.IncVat != 4000 {
|
|
t.Fatalf("expected IncVat 4000 got %d", p.IncVat)
|
|
}
|
|
if p.VatRates[25] != 800 {
|
|
t.Fatalf("expected VAT 800 got %d", p.VatRates[25])
|
|
}
|
|
if p.ValueExVat() != exBefore*2 {
|
|
t.Fatalf("expected exVat %d got %d", exBefore*2, p.ValueExVat())
|
|
}
|
|
}
|
|
|
|
func TestGetTaxAmount(t *testing.T) {
|
|
tests := []struct {
|
|
total int64
|
|
tax int
|
|
expected int64
|
|
desc string
|
|
}{
|
|
{1250, 2500, 250, "25% VAT"}, // 1250 / (1 + 100/25) = 1250 / 5 = 250
|
|
{1000, 2000, 166, "20% VAT"}, // 1000 / (1 + 100/20) = 1000 / 6 ≈ 166
|
|
{1200, 2500, 240, "25% VAT on 1200"},
|
|
{0, 2500, 0, "zero total"},
|
|
{100, 1000, 9, "10% VAT"}, // tax=1000 for 10%, 100 / (1 + 100/10) = 100 / 11 ≈ 9
|
|
{100, 10000, 50, "100% VAT"}, // tax=10000 for 100%, 100 / (1 + 100/100) = 100 / 2 = 50
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
result := GetTaxAmount(tt.total, tt.tax)
|
|
if result != tt.expected {
|
|
t.Errorf("GetTaxAmount(%d, %d) [%s] = %d; expected %d", tt.total, tt.tax, tt.desc, result, tt.expected)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestNewPriceFromIncVatEdgeCases(t *testing.T) {
|
|
// Zero VAT rate
|
|
p := NewPriceFromIncVat(1000, 0)
|
|
if p.IncVat != 1000 {
|
|
t.Errorf("expected IncVat 1000, got %d", p.IncVat)
|
|
}
|
|
if len(p.VatRates) != 1 || p.VatRates[0] != 0 {
|
|
t.Errorf("expected VAT 0 for rate 0, got %v", p.VatRates)
|
|
}
|
|
if p.ValueExVat() != 1000 {
|
|
t.Errorf("expected exVat 1000, got %d", p.ValueExVat())
|
|
}
|
|
|
|
// High VAT rate, e.g., 50%
|
|
p = NewPriceFromIncVat(1500, 50)
|
|
expectedVat := int64(1500 / (1 + 100/50)) // 1500 / 3 = 500
|
|
if p.VatRates[50] != expectedVat {
|
|
t.Errorf("expected VAT %d for 50%%, got %d", expectedVat, p.VatRates[50])
|
|
}
|
|
if p.ValueExVat() != 1500-expectedVat {
|
|
t.Errorf("expected exVat %d, got %d", 1500-expectedVat, p.ValueExVat())
|
|
}
|
|
}
|
|
|
|
func TestPriceValueExVatAndTotalVat(t *testing.T) {
|
|
p := Price{IncVat: 13700, VatRates: map[float32]int64{25: 2500, 12: 1200}}
|
|
exVat := p.ValueExVat()
|
|
totalVat := p.TotalVat()
|
|
if exVat != 10000 {
|
|
t.Errorf("expected exVat 10000, got %d", exVat)
|
|
}
|
|
if totalVat != 3700 {
|
|
t.Errorf("expected totalVat 3700, got %d", totalVat)
|
|
}
|
|
if exVat+totalVat != p.IncVat {
|
|
t.Errorf("exVat + totalVat should equal IncVat: %d + %d != %d", exVat, totalVat, p.IncVat)
|
|
}
|
|
|
|
// Empty VAT rates
|
|
p2 := Price{IncVat: 500, VatRates: nil}
|
|
if p2.ValueExVat() != 500 {
|
|
t.Errorf("expected exVat 500 for no VAT, got %d", p2.ValueExVat())
|
|
}
|
|
if p2.TotalVat() != 0 {
|
|
t.Errorf("expected totalVat 0, got %d", p2.TotalVat())
|
|
}
|
|
}
|
|
|
|
func TestMultiplyPriceWithZeroQty(t *testing.T) {
|
|
base := Price{IncVat: 1250, VatRates: map[float32]int64{25: 250}}
|
|
multiplied := MultiplyPrice(base, 0)
|
|
if multiplied.IncVat != 0 {
|
|
t.Errorf("expected IncVat 0, got %d", multiplied.IncVat)
|
|
}
|
|
if len(multiplied.VatRates) != 1 || multiplied.VatRates[25] != 0 {
|
|
t.Errorf("expected VAT 0, got %v", multiplied.VatRates)
|
|
}
|
|
}
|
|
|
|
func TestPriceAddSubtractEdgeCases(t *testing.T) {
|
|
a := Price{IncVat: 1000, VatRates: map[float32]int64{25: 200}}
|
|
b := Price{IncVat: 500, VatRates: map[float32]int64{12: 54}} // Different rate
|
|
|
|
acc := NewPrice()
|
|
acc.Add(a)
|
|
acc.Add(b)
|
|
|
|
if acc.VatRates[25] != 200 || acc.VatRates[12] != 54 {
|
|
t.Errorf("expected VAT 25:200, 12:54, got %v", acc.VatRates)
|
|
}
|
|
|
|
// Subtract more than added (negative VAT)
|
|
acc.Subtract(a)
|
|
acc.Subtract(b)
|
|
acc.Subtract(a) // Subtract extra a
|
|
if acc.VatRates[25] != -200 || acc.VatRates[12] != 0 {
|
|
t.Errorf("expected negative VAT for 25 after over-subtract, got %v", acc.VatRates)
|
|
}
|
|
}
|